Modify LM6172 for 12V

justpoor · 11th March 2005, 07:44 PM

How do I modify LM6172 opamp chip to work in placement of op275. I think LM6172 is 15V where op275 is only 12V.

Also, is there anyway that I can modify OPA627 to replace op275 - i think the pin is different so this maybe more tricky.

Thanks in advance.

breez · 11th March 2005, 07:58 PM

http://tangentsoft.net/audio/opamps.html

According to this the LM6172 really shines at lower voltage levels compared to many other op-amps, especially the OP275. This test was made with headphone use in mind, but I wouldn't think the proportions change much in other applications.

justpoor · 11th March 2005, 08:42 PM

Thanks Breez. Looks like it would require lot of works to make it work.

motherone · 11th March 2005, 09:12 PM

Yup. Fast bipolar opamps are a pain-in-the... to get working without oscillating or having DC-offset. If you follow the head-fi forums, the 6171/6172 are very higly thought-of chips, even with big electrolytics in the signal path.

I believe the White Noise Audio headphone amp uses the 6171.

Anyhow, I'm pretty happy with my Burrbrown FET-input Op-amps. I may experiment with the 6171/72 later on (I have a ton laying around) when I have time to invest on making them work correctly.

poynton · 11th September 2005, 04:00 PM

The LM6172 is highly rated on a couple of sites for modding Marantz cd players, as the i/v stage. This is because the LM6172 is symmetrical for + & - . An alternate chip may be AD844, also symmetrical. ( Use with adapter ). This does not seem to have any comments about oscillating etc. so may be easier to use?
Anyone know a good source for LM6172 chips. ? They seem unobtainable in the UK. Andy

rfbrw · 11th September 2005, 05:30 PM

Quote:

Originally posted by poynton
The LM6172 is highly rated on a couple of sites for modding Marantz cd players, as the i/v stage. This is because the LM6172 is symmetrical for + & - . An alternate chip may be AD844, also symmetrical. ( Use with adapter ). This does not seem to have any comments about oscillating etc. so may be easier to use?
Anyone know a good source for LM6172 chips. ? They seem unobtainable in the UK. Andy

RS Components definitely carry them. Farnell and Rapid maybe.

11th March 2005, 07:44 PM	#1
justpoor diyAudio Member Join Date: Feb 2005 Location: USA	Modify LM6172 for 12V How do I modify LM6172 opamp chip to work in placement of op275. I think LM6172 is 15V where op275 is only 12V. Also, is there anyway that I can modify OPA627 to replace op275 - i think the pin is different so this maybe more tricky. Thanks in advance.

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11th March 2005, 07:58 PM	#2
breez diyAudio Member Join Date: Jul 2004 Location: Finland	http://tangentsoft.net/audio/opamps.html According to this the LM6172 really shines at lower voltage levels compared to many other op-amps, especially the OP275. This test was made with headphone use in mind, but I wouldn't think the proportions change much in other applications.

11th March 2005, 08:42 PM	#3
justpoor diyAudio Member Join Date: Feb 2005 Location: USA	Thanks Breez. Looks like it would require lot of works to make it work.

11th March 2005, 09:12 PM	#4
motherone diyAudio Member Join Date: Apr 2003 Location: Seattle	Yup. Fast bipolar opamps are a pain-in-the... to get working without oscillating or having DC-offset. If you follow the head-fi forums, the 6171/6172 are very higly thought-of chips, even with big electrolytics in the signal path. I believe the White Noise Audio headphone amp uses the 6171. Anyhow, I'm pretty happy with my Burrbrown FET-input Op-amps. I may experiment with the 6171/72 later on (I have a ton laying around) when I have time to invest on making them work correctly.

11th September 2005, 04:00 PM	#5
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	The LM6172 is highly rated on a couple of sites for modding Marantz cd players, as the i/v stage. This is because the LM6172 is symmetrical for + & - . An alternate chip may be AD844, also symmetrical. ( Use with adapter ). This does not seem to have any comments about oscillating etc. so may be easier to use? Anyone know a good source for LM6172 chips. ? They seem unobtainable in the UK. Andy

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